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Laser shot blasting method for surface of grinding roller of flour mill

A technology of laser shot peening and flour mill is applied in the field of surface treatment of grinding rollers of flour mills, which can solve the problems of inability to change the hardness of grinding rollers, and achieve the effects of improving microstructure, improving performance, and improving antifouling performance.

Inactive Publication Date: 2018-04-17
WUHE HUANGHUAI GRAIN & OIL MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the manufacturing process of flour machine grinding rollers, it is necessary to carry out surface treatment to improve the performance of flour mill grinding rollers. During the processing, the hardness of the grinding rollers cannot be changed. In the prior art, it is difficult do it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for laser peening on the surface of a flour mill roller, comprising the following steps:

[0015] (1) After cleaning the surface of the prepared flour mill roller, put it into the vacuum chamber, and after vacuuming to the limit, raise the temperature in the vacuum chamber to 280°C and then inject silane gas into it, and then reduce the temperature in the vacuum chamber to 280°C. After rising to 380°C, after 5 hours of heat preservation treatment, the vacuum chamber was lowered to room temperature, and the flour mill roller was taken out;

[0016] (2) Put the flour mill roller processed in step (1) into the laser peening device for laser peening, where the peening energy density is 3GW / cm 2 , The shot peening overlap rate is 55%.

[0017] Specifically, in the above step (1), the cleaning method is as follows: after the surface of the grinding roller of the flour machine is scrubbed with absorbent cotton, it is put into an alkaline degreasing agent with a mass ...

Embodiment 2

[0021] A method for laser peening on the surface of a flour mill roller, comprising the following steps:

[0022] (1) After cleaning the surface of the prepared flour mill roller, put it into the vacuum chamber, and after vacuuming to the limit, raise the temperature in the vacuum chamber to 290°C and then inject silane gas into it, and then reduce the temperature in the vacuum chamber to 290°C. After rising to 390°C, after heat preservation treatment for 6 hours, lower the vacuum chamber to room temperature, and take out the grinding roller of the flour machine;

[0023] (2) Put the flour mill roller processed in step (1) into the laser peening device for laser peening operation, where the peening energy density is 3.5GW / cm 2 , The shot peening overlap rate is 60%.

[0024] Specifically, in the above step (1), the cleaning method is as follows: after the surface of the grinding roller of the flour machine is scrubbed with absorbent cotton, it is put into an alkaline degreasi...

Embodiment 3

[0028] A method for laser peening on the surface of a flour mill roller, comprising the following steps:

[0029] (1) After cleaning the surface of the prepared flour mill roller, put it into the vacuum chamber, and after evacuating to the limit, raise the temperature in the vacuum chamber to 300°C and then inject silane gas into it, and then reduce the temperature in the vacuum chamber to 300°C. After rising to 400°C, after 7 hours of heat preservation treatment, the vacuum chamber was lowered to room temperature, and the flour mill roller was taken out;

[0030] (2) Put the flour mill roller processed in step (1) into the laser peening device for laser peening, where the peening energy density is 4GW / cm 2 , The shot peening overlap rate is 65%.

[0031] Specifically, in the above step (1), the cleaning method is as follows: after the surface of the grinding roller of the flour machine is scrubbed with absorbent cotton, it is put into an alkaline degreasing agent with a mass...

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PUM

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Abstract

The invention discloses a laser shot blasting method for the surface of a grinding roller of a flour mill. The laser shot blasting method includes the following operation steps that firstly, after thesurface of the prepared and formed grinding roller of the flour mill is cleaned, the grinding roller of the flour mill is placed into a vacuum chamber, after vacuumizing is performed to reach extremity and the temperature in the vacuum chamber rises to 280-300 DEG C, silane gas is introduced into the vacuum chamber, then the temperature in the vacuum chamber rises to 380-400 DEG C, after heat-preserving treatment is performed for 5-7 hours, the vacuum chamber is lowered to the room temperature, and the grinding roller of the flour mill taken out; and secondly, the grinding roller, treated inthe first step, of the flour mill is placed into a laser shot blasting device, and is subjected to laser shot blasting operation, the shot blasting energy density is 3-4 GW / cm<2>, and the shot blasting lap joint rate is 55-65%. By means of the laser shot blasting method for the surface of the grinding roller of the flour mill, the microscopic structure in the grinding roller can be improved, the toughness and the corrosion resistant performance of the surface of the grinding roller of the flour mill can be effectively improved, the anti-pollution performance of the surface of the grinding roller can be improved, and it is achieved that flour is not likely to remain on the surface of the grinding roller.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of flour mill rollers, and in particular relates to a method for laser blasting the surface of flour mill rollers. Background technique [0002] The flour machine grinding roller is an important equipment on the flour machine. The inside is carbon steel, and the outside is nickel, molybdenum, chromium and other alloys. The material of the flour machine should be neither soft nor hard. The flour that grinds out is gray, hard and difficult for wire drawing, and the hardness of grinding roller in the prior art is 50-70HRC. However, during the manufacturing process of flour machine grinding rollers, it is necessary to carry out surface treatment to improve the performance of flour mill grinding rollers. During the processing, the hardness of the grinding rollers cannot be changed. In the prior art, it is difficult do it. Contents of the invention [0003] In order to solve the above-ment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00
CPCC21D10/005
Inventor 武献东
Owner WUHE HUANGHUAI GRAIN & OIL MACHINERY CO LTD